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www.fairchildsemi.com
FAN8728
Spindle + 4-CH Input PWM Motor Drive IC
Features

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Description
/012*1" "3 % # " 4+%" +" +, " " % &
5/!&5/!0/.6/60 "7" 48-QFPH-1414
Typical Applications
&"4
7 . "4
7 &"4
7 07"
Ordering Information
Device FAN8728 Package 48-QFPH-1414 Operating Temp -5C ~ 8C
Rev. 1.0.0
(c)2002 Fairchild Semiconductor Corporation
FAN8728
Pin Assignments

48 1
47
46
45
44
43
42
41
40
39

38
37 36

2
35 34 33 32 31
3
4

5
6
7 30 8 29 9 28

10
27

11
26
12 13 14 15 16
17 18 19 20 21 22 23 24
25
2
FAN8728
Pin Definitions
Pin Number 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 Pin Name H1+ H1H2+ H2H3+ H3FG DIR SVCC1 VM1 CS1 PGND1 A3 A2 A1 SGND IN3+ IN3OUT3 IN2+ IN2OUT2 VM2 IN2+ IN2OUT2 DO1+ DO1DO2+ DO2PGND2 DO3+ DO3I/O I I I I I I O O I O O O I I O I I O I I O O O O O O O Hall1(+) Input Hall1(-) Input Hall2(+) Input Hall2(-) Input Hall3(+) Input Hall3(-) Input FG Output Direction SIGNAL VCC1 Motor Power Supply Current Sensor Power Ground 3-Phase Output 3 3-Phase Output 2 3-Phase Output 1 Signal Ground Op-amp CH3 Input(+) Op-amp CH3 Input(-) Op-amp CH3 Output Op-amp CH2 Input(+) Op-amp CH2 Input(-) Op-amp CH2 Output BTL CH1,2 Supply Voltage Op-amp CH2 Input(+) Op-amp CH2 Input(-) Op-amp CH2 Output BTL Drive 1 Output(+) BTL Drive 1 Output(-) BTL Drive 2 Output(+) BTL Drive 2 Output(-) BTL Power Gnd BTL Drive 3 Output(+) BTL Drive 3 Output(-) Pin Function Descrition
3
FAN8728
Pin Definitions (Continued)
Pin Number 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 Pin Name DO4+ DO4IN4 VREF4 VM4 VM3 SVCC2 VREF123 MUTE123 MUTE4 SS OUTS INSINS+ PC1 I/O O O I I I I I I O I I I Pin Function Descrition BTL Drive 4 Output(+) BTL Drive 4 Output(-) BTL CH4 Input BTL CH4 Reference BTL CH4 Motor Supply BTL CH3 Motor Supply BTL Signal VCC BTL CH1,2,3 Rference BTL CH1,2,3 Mute BTL CH4 Mute Spindle Start/Stop Opamp Spindle Output Opamp Spindle Input(-) Opamp Spindle Input(+) Phase Compesation Cap.
4
FAN8728
Internal Block Diagram
MUTE4 (LOADING)
FIN(GND)
MUTE123
VREF123
SVCC2
INS+
INS-
48
47
46
45
44
43
42
41
40
39
38
37
H1+ H1-
1
VREF4
OUTS
PC1
SS
VM3
VM4
36
IN4 DO4DO4+ DO3DO3+
2
35
Hall Amp
H2+ H2H3+ H3-
3
34
4
Absolute Values
VM1 CS1 Current Sense Amp
VM4
33
5
32
6
Output Current Limit
VM3
31
PGND2
FG1X Generator
Detection FIN(GND) Logic Reverse Rotation
VM2
FIN(GND)
FG DIR SVCC1 VM1
7
30
DO2DO2+ DO1DO1+
8
29
9
28
Distributor
10
VM2
27
CS1 PGND1
11
26
OUT1 IN1-
12
25
Driver
13 14 15 16 17 18 19 20 21 22 23 24
SGND
A3
A2
A1
FIN(GND)
OUT2
IN3+
IN2+
IN3-
OUT3
VM2
IN2-
IN1+
5
FAN8728
Equivalent Circuits
FG Signal Output Phase Compensation Capacitor

Current Detector
Start/Stop

BTL Drive Mute
BTL Bias Voltage

6
FAN8728
Equivalent Circuits (Continued)
3-Phase Rotational Direction Output BTL Drive Output

3-Phase Output
BTL Drive Input

7
FAN8728
Absolute Maximum Ratings ( Ta=25C)
Parameter Supply Voltage (BTL Signal) Supply Voltage (Spindle Signal) Supply Voltage (Motor) Supply Voltage (BTL Motor) Power Dissipation Operating Temperature Range Storge Temperature Range Maximum Output Current (Spindle Part) Maximum Output Current (BTL Part) Symbol SVCC2max SVCC1max VMmax VM2,3,4max Pd Topr Tstg IOMAXS IOMAXB Value 15 7 15 15 2.7note -35 ~ +85 -55 ~ +150 1.3 1 Unit V V V V W
C C
A A
Note : 1. When mounted on 70mm x 1.6mm PCB (Phenolic resin material) 2. Power dissipation is reduced 21.6mW/C for using above Ta = 25C 3. Do not exceed Pd and SOA.
Pd [mW] 3,000 2,000 1,000 0
0
25
50
75
100
125
150
175
Ambient Temperature, Ta [C]
Recommended Operating Conditions ( Ta=25C)
Parameter Operating Supply Voltage (BTL Signal) Operating Supply Voltage (Spindle Signal) Operating Supply Voltage ( Spindle Motor) Operating Supply Voltage (BTL Motor) Symbol SVCC2 SVCC1 VM1 VM2,3,4 Min. 4.5 4.5 4.5 4.5 Typ. Max. 13.2 5.5 13.2 13.2 Unit V V V V
8
FAN8728
Electrical Characteristics
(Ta=25C, SVCC1=5V, VM1=8V) Parameter Circuit Current 2 START/STOP SS On Voltage Range SS Off Voltage Range HALL AMP Hall Bias Current In-phase in Voltage Range Minimum in Level TORQUE CONTROL Offset Voltage (-) Offset Voltage (+) In/output Gain FG FG Output Voltage (L) Input Voltage Range OUTPUT BLOCK Saturation Voltage (upper TR) Saturation Voltage (lower TR) Torque Limit Current DIRECTION DETECTOR Dir Output Voltage (L) VDIRL IFG=10uA 0.5 V VOH VOL ITL IO= -300mA IO=300mA RCS=0.5 560 0.9 0.2 700 1.6 0.6 840 V V mA VFHL VFGR IFG=10uA Hn+, Hn- input D-range 1.5 0.5 4.0 V V ECOFFECOFF+ GEC ECR=1.65V ECR=1.65V ECR=1.65V, RCS=0.5 -100 20 0.56 -50 50 0.71 -20 100 0.84 mV mV A/V IHA VHAR VINH 1.5 60 1 5 4.0 uA V mVpp VSSON VSSOFF L-H Circuit On H-L Circuit Off 2.5 1.0 V V Symbol ICC2 Condition Start/Stop =5V Min. Typ. 6 Max. Unit mA
9
FAN8728
Electrical Characteristics (continued)
BTL Drive Part (Ta=25C, SVCC2=8V, VM2,3,4=8V, RL=24) Parameter BTL DRIVE PART Quiescent Circuit Current CH Mute123 Off Voltage CH Mute123 On Voltage CH Mute4 Off Voltage CH Mute4 On Voltage Output Offset Voltage Maximum Output Voltage1,2,3 Close Loop Voltage Gain Ripple Rejection Ratio Slew Rate 1,2,3 Output Offset Voltage4 Maximum Output Voltage4 Close Loop Voltage Galin Ripple Rejection Ratio4 Slew Rate 4 OP- AMP Input Offset Voltage Input Bias Current High Level Output Voltage Low Level Output Voltage Output Sink Current Output Source Current Open Loop Voltage Gain Ripple Rejection Ratio Slew Rate Common Mode Rejection Ratio VOF IB1 VOHOP VOLOP ISINK ISOURCE GVOOP RROP SROP CMRROP f=1kHz, VIN=-75dB f=120Hz, VIN=-20dB f=120Hz, 2Vp-p f=1kHz, VIN=-20dB -20 11 5.5 4.5 75 65 1 80 +20 300 0.1 mV nA V V mA mA dB dB V/us dB ICC3 VMOFF123 VMON123 VMOFF4 VMON4 VOF1,2,3 VOM1,2,3 GVC1,2,3 RR1,2,3 SR1,2,3 VOF4 VOM4 GVC4 RR4 SR4 pin42= Variation plin42 = Variation pin43 = Variation pin43 = Variation f=1kHz, VIN=-0.1Vrms f=120Hz, VIN=-20dB f=120Hz, 2Vp-p f=1kHz, VIN=-0.1Vrms f=120Hz, VIN=-20dB f=120Hz, 2Vp-p 2.5 2.5 -50 3.6 10.5 -50 6.0 10.5 20 4.0 12.0 60 1.0 6.5 12.0 60 1.0 1.0 1.0 +50 13.5 +50 13.5 mA V V V V mV V dB dB V/us mV V dB dB V/us Symbol Condition Min. Typ. Max. Unit
CH1,2,3(SVCC2=8V VM2=5V,RL=8)
CH4(SVCC2=8V VM4=8V,RL=12)
10
FAN8728
Calculation of Gain & Torque Limit Current
VM1 IO
VM1
RCS Current / Voltage Convertor - Vin EC ECR + Gm Absolute Values + + + + Vmax - VM Max. output current limiting H1 H2 Driver R1 -
- VS Output Current sense + CS1 (Pin 11)
Negative Feedback loop U V W IO
Power Transistors
Commutation Distributor
H3
8-,99" %& "!)"%: 60.355 Gain R CS
.:" 3 34"" ,98.Vmax 350 [ mV ] Itl [ mA ] R CS R CS
Application Information
1. Mute Function
) & . ; " %+ ""%"MUTE123,4 ON Voltage MUTE123,4 OFFVoltage * & " " " % ; "
(0 % " 3 )<.=+ "" " 7 ; " 3 *-9<.=+ " " "3 6% > " "3 )?9+ "" "#$ ", " , 6!"" ## 2.5[V] above OPEN or 0.5[V] below Mute function operation Normal operation
11
FAN8728
2. CH1,2,3 Balanced Transformerless (BTL) Drive (Error Amp Included)
VCC
Q1 DRIVE AMP X2 Q3 32 29 27 M 33 30 28
Q2
DRIVE AMP X2
Q4
GND
17 20 24 18 21 25 19 22 26 41 Vref123 + - + AMP1 - LEVEL SHIFT
.
+.3"+" % 37 : 3" % #)- "% " %% 3 ". 37 % .3"- "@66 % 3%% " 3%% " !% " " % " " " + "% 37 !A) !A#- +%!A*!A, + " " - ."3 .3"+ "% -
12
FAN8728
3. CH4 Balanced Transformerless (BTL) Driver
VCC
Q1 DRIVE AMP X2 Q3 M 34 35
Q2
DRIVE AMP X2
Q4
GND
37 Vref4 Vin Rextern 36 10k + AMP1 - LEVEL SHIFT
+.3"+" % 37 : 3" % ,2 ""+.+ " ,? % )8B5! : " % "% "% " %% 3 ". 37 % .3"- "@66 % 3%% " 3%% " !% " " % ". " " + "% 37 !A)!A#- +%!A*!A, + " " - ; ".+ ,?"3 .3"+ "% ; ".+ ,?"3 .3"+ " " 6%7 + %7 : ""C" ! :
4. Torque & Output Current Control
D E
VM1
VM1 Rcs
+ Torque sense amp VAMP ECR + - + - TSD EC Current sense amp
-
VRNF IO Driver M
Gain Controller
7 %7 %% 3 ((% 6+ D " " /&
" .% " " /&
" " /&
" % 6% 3
13
FAN8728
37 .+ 6" 37 " " ""!
" .
6 + ""% 6 7% 37 6% ; > " " 3)?9+ 3 "- % D """3 VRNF [V] Reverse Forward
Rotation Ec < ECR Forward rotation Stop after detecting reverse rotation
Ecoff-
Ecoff+
Ec > ECR
3 mV
-50
0
+50
ECR-EC[mV]
(% D " /&
"8-9.F,-,.
5. Thermal Shutdown (TSD) Function
; > " " 3)?9+ ""+ > %"%%3)#8+ 3 7 -6" 7" ""%3*9-
6. Rotational Direction Detecting Function
H2+ H2-
+ - D R 8 Q DIR
Rotation EC < ECR Forward Reverse
DIR Low High
CK H3+ H3- + - D-F/F
EC > ECR
% " "% & 37 +"" 3 3 - % &3 37 %"% " "5 - " ""3 $)+$*$, " 7-6% " "" +$)$* $,+% " + %"% " ""3 ""3 H1
H2
H3
( a)
14
FAN8728
6 " 7+% " "" +$, $* $)+% %+ %"% " ""3 "" : -
H1
H2
H3
( b)
6 " "3 + %$* % "%$,"% GH+ $% G3H- 4 " %" -
15
FAN8728
7. REVERSE ROTATION PREVENTING FUNCTION
EC ECR
+ Current Sense Amp
H2+ H2-
+ - D CK D-F/F Gain Controller Driver M Q
H3+ H3-
+ -
% " % +"" 3 3 +37 "3 - " D 7 " + 5 A3 ""%% " " / + " " % % ; &"% +(H("" " 5" &-/" %(H( " +&""+" "+ " " - &% " + " ""%" D -6" " """ 3 Reverse Rotation Preventer ECECR Brake and Stop Stop
Rotation Forward Reverse
H2 H L
H3 HL HL
D-F/F H L
DIR L H
16
FAN8728
8. HALL INPUT OUTPUT TIMMING CHART
, " "" % % "" :" + ""% % 3 -/% "" + "" + " - " "% "+ + "3 -
H1 +
H2 +
H3 +
A1 output current
A1 output voltage
A2 output current
A2 output voltage
A3 output current
A3 output voltage
17
FAN8728
9. FG OUTPUT FUNCTION
+ " 3 %"% &+" 373I "" %"% " ""- """3 -
FG OUTPUT (FG) , Pin7 + H1 -
18
FAN8728
Typical Performance Characteristics
Vcc vs Icc2 10 8 Icc2(mA) 6 4 2 0 4.5 4.75 5 Vcc(V) 5.25 5.5

Vinvs Vout 6 4 0 -2 -4 -6 0 0.5 1 1.5 2 2.5 Vin (V) 3 3.5 4 4.5 5
Gcv(dB) 14 13.5 13 12.5 12 11.5 11 10.5 10 4.5
Vcc vs G cv
Vout(V)
2
6.5
8.5 Vcc(V)
10.5
12.5
Ins+vs Itl 0.8 Icc2(mA) 0.6 Itl(A) 0.4 0.2 0 0 0.825 1.65 Ins+(V ) 2.475 3.3 10 9 8 7 6 5 4 3 2 -40
Tem vs Icc2 p
-20
0
20
40
60
80
100
Tem ) p(
19
FAN8728
Typical Performance Characteristics
Temp vs Icc3 30 25 Icc3(mA) 20 15 10 5 0 -40
Tem vs ITL p 850 800 ITL(mA) 750 700 650 600 550 -40
-20
0
20
40
60
80
100
-20
0
20
40
60
80
100
Temp( )
Trm ) p(
Tem vs V p om (V vcc=8V L=12 O ) cc=P ,R hm 7 Vom(V) 6.75 6.5 6.25 6 -40 -20 0 20 40 60 80 100
Tem ) p(
20
FAN8728
Test Circuits

48 PC1
47 INS+
46 INS-
45 OUTS
44 SS
43 MUTE4
42 MUTE123
41 VREF123
40 SVCC2
39 VM3
38 VREF4 V\M4
37 36 IN4

1 2 3 4 5 6
H1+ H1H2+ H2H3+ H3-
DO4- 35 DO4+ 34 DO3- 33 DO3+ 32 PGND2 31

7 8 FGX3 DIR SVCC1 VM1
DO2- 30 DO2+ 29

9 10
DO1- 28 DO1+ 27 OUT1 26 OUT3 SGND OUT2 IN2+ IN3+ IN1+ IN3IN2VM2 A2 A3 IN1- 25

11 CS1
12 A1 13
PGND1
14
15
16
17
18
19
20
21
22
23
24

21
FAN8728
Application Circuits
. &
!"#
$%"& !"#
"
"

48 1 HALL1 2
47
46
45
44
43
42
41
40
39
38
37
36 '()!* !"#

35
M

3 HALL2 4 33 34
M
5 HALL3 6 31 32

7

30

8 29
9

24
28

10
13 27
11
26
12
25
14
15
16
17
18
19
20
21
22
23

22

FAN8728
Application Circuits
%% &
!"#
$%"& !"#
"
"

48 1 HALL1 2
47
46
45
44
43
42
41
40
39
38
37
36 '()!* !"#

35
M

3 HALL2 4 33 34
M
5 HALL3 6 32

31

7
30

8
29
9

24
28

10
13 27
11
26
12
25
14
15
16
17
18
19
20
21
22
23

23
FAN8728
Package Dimensions (Unit: mm)
48-QFPH-1414
17.20 0.30 14.00 0.20
17.20 0.30
14.00 0.20
#48
#1
+0.10 0.30 -0.05 0.10MAX
(0.825)
0.65 3.00MAX 2.60 0.10
+0.10 0.20 -0.05
(4.85)
0~8
0.10MAX 0.00~0.25
0.80 0.20
24
FAN8728
25
FAN8728
DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user.
www.fairchildsemi.com 1/17/02 0.0m 001 Stock#DSxxxxxxxx 2002 Fairchild Semiconductor Corporation
2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.

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